From @masak

Quoth S06​:

As with module and class declarations, a sub declaration
ending in semicolon is allowed at the outermost file scope if it is the
first such declaration, in which case the rest of the file is the body​:

  sub MAIN ($directory, :$verbose, *%other, *@​filenames);
  for @​filenames { ... }

This form is allowed only for simple subs named C<MAIN> that are intended
to be run from the command line.
A C<proto> or C<multi> definition may not be written in semicolon form,
nor may C<MAIN> subs within a module or class be written in semicolon
form. (A C<MAIN> routine
is allowed in a module or class, but is not usually invoked unless
the file is run directly (see a above). This corresponds to the
"unless caller" idiom of Perl 5.) In general, you may have only one
semicolon-style declaration that controls the whole file.

<masak> m​: sub MAIN();␤say "OH HAI"
<camelia> rakudo-moar 1e4fe4​: OUTPUT«===SORRY!=== Error while
compiling /tmp/A5naXHrUhH␤Missing block␤at /tmp/A5naXHrUhH​:1␤------>
sub MAIN()⏏; [...]
* masak submits NYI rakudobug
<Mouq> masak​: What's that supposed to do?
<masak> Mouq​: whole-file MAIN only sub.
<Mouq> Ooo
<masak> S06​:3408
<synopsebot> Link​: http://perlcabal.org/syn/S06.html#line_3408
<Mouq> Could be useful for one-liners too...

From @Mouq

Feature added in Rakudo commit

commit 073586b65db6e05c1207aea0f985d905c0328ad7
Author​: Mouq <alexmoquin@​gmail.com>
Date​: Mon Feb 2 02​:26​:10 2015 -0500

  Allow `sub MAIN($params); …` declarations — RT #​123309

Tests added in Roast commit

commit 093f03fe68ce301f5c8aa85ae7b3e4a6b279383c
Author​: Mouq <alexmoquin@​gmail.com>
Date​: Mon Feb 2 03​:25​:40 2015 -0500

  Add and correct tests for `sub MAIN;` form

Marking as resolved :)

On Thu Nov 27 06​:09​:50 2014, masak wrote​:

Quoth S06​:

As with module and class declarations, a sub declaration
ending in semicolon is allowed at the outermost file scope if it is the
first such declaration, in which case the rest of the file is the body​:

sub MAIN \($directory, :$verbose, \*%other, \*@​filenames\);
for @​filenames \{ \.\.\. \}

This form is allowed only for simple subs named C<MAIN> that are intended
to be run from the command line.
A C<proto> or C<multi> definition may not be written in semicolon form,
nor may C<MAIN> subs within a module or class be written in semicolon
form. (A C<MAIN> routine
is allowed in a module or class, but is not usually invoked unless
the file is run directly (see a above). This corresponds to the
"unless caller" idiom of Perl 5.) In general, you may have only one
semicolon-style declaration that controls the whole file.

<masak> m​: sub MAIN();␤say "OH HAI"
<camelia> rakudo-moar 1e4fe4​: OUTPUT«===SORRY!=== Error while
compiling /tmp/A5naXHrUhH␤Missing block␤at /tmp/A5naXHrUhH​:1␤------>
sub MAIN()⏏; [...]
* masak submits NYI rakudobug
<Mouq> masak​: What's that supposed to do?
<masak> Mouq​: whole-file MAIN only sub.
<Mouq> Ooo
<masak> S06​:3408
<synopsebot> Link​: http://perlcabal.org/syn/S06.html#line_3408
<Mouq> Could be useful for one-liners too...

The RT System itself - Status changed from 'new' to 'open'

@Mouq - Status changed from 'open' to 'resolved'